apavalinimui yra keletas funkciju:
ceil() - apvalina i didesne puse
ceil(4.1) =  5;
floor() - i mazesne
floor(4.9) = 4
ruond() - matematiskai apvalina
round(4.5) = 5
round(4.1) = 4
round(4.6) = 5
number_format - pertvarko skaiciu i tam tikra formata, galima nurodyti kiek skaiciu po kableliu, kaip atskirti tukstancius, po kablelio esnacius skaicius.
$number = number_format(1234.56, 2, ',', ' ');
// 1 234,56
http://php.net/manual/en/function.floor.php
http://php.net/manual/en/function.ceil.php
http://php.net/manual/en/function.round.php
http://php.net/manual/en/function.number-format.php